single-word-requests, which is for questions specifically seeking single words rather than phrases, though both tags may be used in conjunction when you want a term but don't care if it's a single-word or multi-word term

word-choice, which is for "versus" questions, when you already have several alternatives at your disposal, but are not sure which one to use

vocabulary, which is for more broad questions, e.g. those that ask for lots of words at once